Common Evening Primrose, Evening Star, Sun Drop - Oenothera biennis

Oenothera biennis - Common Evening Primrose, Evening Star, Sun Drop. Common Evening Primrose is found in all but 7 states. From Carol in Virginia: "It booms just at dusk and you can actually see the petals move as it opens... All the grandchildren love to gather around a plant and guess which one will open next."